CER Scope Inspection and Testing 4 — Questions and Answers
Question 1: Why must all removable components such as valves and caps be removed before inspection and leak testing?
- To prevent damage to the components during pressure testing
- To allow thorough visual inspection and ensure accurate pressure readings (Correct answer)
- To speed up the drying process after testing
- To comply with OSHA lockout/tagout requirements
Correct answer: To allow thorough visual inspection and ensure accurate pressure readings
Removing valves and caps allows full visual access to ports and channels and ensures the leak test accurately reflects the scope body's integrity rather than masked by sealed components.
Question 2: A duodenoscope elevator mechanism is stiff and does not move freely during functional inspection. This finding suggests:
- Normal resistance due to a new scope design
- Residual enzymatic cleaner trapped in the mechanism
- Possible debris accumulation or mechanical damage requiring repair evaluation (Correct answer)
- The elevator was correctly cleaned and the friction is protective
Correct answer: Possible debris accumulation or mechanical damage requiring repair evaluation
A stiff elevator mechanism may indicate residual soil or mechanical damage; the duodenoscope's elevator channel is a known contamination risk and requires thorough evaluation.
Question 3: Which action confirms that a scope's air/water channel is fully patent after reprocessing?
- Visual confirmation of water flowing from the distal tip nozzle (Correct answer)
- Pressure-testing the air/water channel to 100 psi
- Immersing the scope in water and activating the air pump
- Weighing the scope before and after to detect retained fluid
Correct answer: Visual confirmation of water flowing from the distal tip nozzle
Visually confirming that water flows freely from the distal nozzle when the air/water channel is flushed confirms the channel is patent.
Question 4: When using a pressure manometer during leak testing, the pressure gauge should be read after:
- Immediately pressurizing the scope before submerging
- Pressurizing to the specified range and stabilizing for 30 seconds, then submerging (Correct answer)
- Completing submersion and waiting 10 minutes
- Activating the leak tester but before attaching to the scope
Correct answer: Pressurizing to the specified range and stabilizing for 30 seconds, then submerging
Pressure must be allowed to stabilize before submerging so the baseline is established, then any subsequent drop indicates a leak.
Question 5: An endoscope returned to the reprocessing area has a bend in the insertion tube that will not relax. The most likely cause is:
- Improper storage hanging position causing natural sag
- Coiling the scope too tightly beyond the minimum bend radius during use or transport (Correct answer)
- Inadequate lubrication of the insertion tube
- Excessive suction applied during the procedure
Correct answer: Coiling the scope too tightly beyond the minimum bend radius during use or transport
Coiling or bending the scope beyond its minimum bend radius can permanently kink internal components, particularly angulation wires and light guide fibers.
Question 6: The correct sequence for visual and functional inspection of an endoscope AFTER bedside pre-cleaning is:
- Leak test → visual inspection → functional check → transport to reprocessing
- Visual inspection → functional check → leak test → transport to reprocessing
- Transport to reprocessing → visual inspection → leak test → functional check (Correct answer)
- Functional check → leak test → visual inspection → enzymatic soak
Correct answer: Transport to reprocessing → visual inspection → leak test → functional check
After bedside pre-cleaning, the scope is transported to the reprocessing room where thorough visual inspection, leak testing, and functional checks are performed before cleaning.
Question 7: What is the significance of checking the light guide bundle for broken fibers during inspection?
- Broken fibers reduce disinfection efficacy by creating shadow zones
- Dark spots in the illumination field reduce visibility and may impair procedural safety (Correct answer)
- Broken fibers increase moisture retention inside the scope body
- Broken fibers trigger false-positive leak test results
Correct answer: Dark spots in the illumination field reduce visibility and may impair procedural safety
Each broken fiber creates a dark spot in the illumination field; sufficient fiber loss significantly degrades image quality and may compromise clinical visualization.
CER Scope Inspection and Testing 4
Why must all removable components such as valves and caps be removed before inspection and leak testing?